and i think the lbj example is not bad one, because during those first six months of 1965, medicare, education, voting rights, all the things that we think of really as the great society didn't happen across four years, really just in that first half of one year. the fact that johnson was asking for all those big things together really helped. >> the end of the iraq war was not marked as a massive occasion in this country when it happened. there was some primetime news programs that didn't cover it the day that it happened, the day that was the end of the war. but people, when you ask them broadly in the country, end up ranking ending the war as president obama's greatest single accomplishment in his first four years. what explains the primacy of that in memory, even as it was buried in the news as we went through it? >> well, go back to the democratic primaries of 2008. what was the biggest issue? barack obama probably became the nominee largely because he was against the war at the beginning. hillary clinton was for it. so people obviously noticed the absence of that. but even more than that